/* ===================================
   OILFIELD SERVICES SUMMIT — MENA EDITION
   Main Stylesheet
   =================================== */

/* === CSS Custom Properties === */
:root {
    /* Brand Colors - Premium Palette */
    --navy: #002D72;
    --navy-blue: #002D72; /* alias for compatibility */
    --navy-900: #001F52; /* darker for high-contrast text */
    --gold: #D4AF37;
    --gold-strong: #B58E2A; /* darker gold for emphasis */
    --deep-red: #8B0000;
    --charcoal: #2F4F4F;
    --charcoal-gray: #2F4F4F; /* alias */
    
    /* Extended Palette */
    --light-gray: #F8F9FA;
    --medium-gray: #6C757D;
    --muted-gray: #6C7A85;
    --dark-gray: #343A40;
    --white: #FFFFFF;
    --black: #000000;
    
    /* Accent Colors */
    --green: #228B22;
    --accent-green: #228B22; /* alias */
    --accent-orange: #FF8C00;
    
    /* Semantic Colors */
    --color-primary: var(--navy);
    --color-secondary: var(--gold);
    --color-accent: var(--deep-red);
    --color-text: var(--charcoal);
    --color-text-light: var(--muted-gray);
    --color-bg: var(--white);
    --color-bg-alt: var(--light-gray);
    
    /* Typography */
    --font-heading: 'Montserrat', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-body: 'Open Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    
    /* Font Sizes - Fluid Typography */
    --fs-hero: clamp(34px, 4.4vw, 48px);
    --fs-h1: clamp(34px, 4.4vw, 48px);
    --fs-h2: clamp(28px, 3.4vw, 36px);
    --fs-h3: clamp(20px, 2.2vw, 28px);
    --fs-h4: 18px;
    --fs-body: 16px;
    --fs-small: 14px;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;
    --spacing-3xl: 6rem;
    --gutter: 24px;
    
    /* Layout */
    --container-width: 1200px;
    --max-width: 1200px;
    --section-padding: var(--spacing-3xl);
    
    /* Shadows - Premium Elevation */
    --shadow-soft: 0 4px 14px rgba(0,0,0,0.06);
    --shadow-sm: 0 4px 14px rgba(0,0,0,0.06); /* alias */
    --shadow-md: 0 10px 30px rgba(0,0,0,0.10);
    --shadow-strong: 0 10px 30px rgba(0,0,0,0.12);
    --shadow-lg: 0 10px 30px rgba(0,0,0,0.12); /* alias */
    --shadow-xl: 0 16px 36px rgba(0,0,0,0.14);
    
    /* Focus State - Accessibility */
    --focus: 3px solid rgba(212,175,55,0.28);
    --focus-ring: 0 0 0 3px rgba(212,175,55,0.28);
    
    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 10px;
    --radius-lg: 12px;
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 280ms cubic-bezier(.2,.9,.3,1);
    --transition-slow: 350ms ease;
}

/* === Reset & Base Styles === */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-body);
    font-size: 16px;
    line-height: 1.6;
    color: var(--charcoal);
    background-color: var(--color-bg);
    overflow-x: hidden;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

a {
    color: var(--navy);
    text-decoration: none;
    transition: color var(--transition-base);
}

a:hover {
    color: var(--deep-red);
}

/* === Global Focus State (Accessibility) === */
*:focus {
    outline: none;
    box-shadow: var(--focus-ring);
    border-radius: 6px;
}

button:focus,
a:focus,
input:focus,
textarea:focus,
select:focus {
    outline: none;
    box-shadow: var(--focus-ring);
}

ul, ol {
    list-style-position: inside;
}

/* === Typography === */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    font-weight: 700;
    line-height: 1.2;
    color: var(--navy-900);
    margin-bottom: var(--spacing-md);
}

h1 {
    font-size: clamp(34px, 4.4vw, 48px);
    color: var(--navy-900);
}

h2 {
    font-size: clamp(28px, 3.4vw, 36px);
    color: var(--navy-900);
}

h3 {
    font-size: clamp(20px, 2.2vw, 28px);
    color: var(--navy-900);
}

h4 {
    font-size: 18px;
    color: var(--navy-900);
}

p {
    font-size: 16px;
    color: var(--charcoal);
    line-height: 1.6;
    margin-bottom: var(--spacing-sm);
}

small {
    font-size: 14px;
    color: var(--muted-gray);
}

strong {
    font-weight: 600;
    color: var(--navy-900);
}

/* === Skip to Content (Accessibility) === */
.skip-link {
    position: absolute;
    top: -40px;
    left: 0;
    background: var(--navy-blue);
    color: white;
    padding: 0.5rem 1rem;
    text-decoration: none;
    z-index: 200;
}

.skip-link:focus {
    top: 0;
}

/* === Container === */
.container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

/* === Section Spacing === */
.section {
    padding: var(--section-padding) 0;
}

.section-title {
    font-size: var(--fs-h2);
    color: var(--navy-blue);
    margin-bottom: var(--spacing-lg);
}

.section-title.center {
    text-align: center;
}

.section-intro {
    font-size: 1.125rem;
    color: var(--charcoal-gray);
    max-width: 800px;
    margin-bottom: var(--spacing-xl);
    line-height: 1.7;
}

.section-intro.center {
    margin-left: auto;
    margin-right: auto;
    text-align: center;
}

/* === Header === */
.header {
    background: var(--white);
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: var(--shadow-md);
    transition: transform var(--transition-base);
}

.header-container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: var(--spacing-sm) var(--spacing-md);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

/* === Logo === */
.logo a {
    display: flex;
    align-items: center;
    color: var(--navy-blue);
}

.logo-img {
    height: 48px;
    width: auto;
    max-width: 240px;
    object-fit: contain;
    transition: opacity var(--transition-base);
}

.logo-img:hover {
    opacity: 0.85;
}

.logo-text {
    font-family: var(--font-heading);
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--navy-blue);
    line-height: 1.1;
    margin-bottom: 0;
}

.logo-edition {
    font-size: 0.75rem;
    color: var(--gold);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* === Navigation === */
.nav-main {
    display: flex;
    align-items: center;
}

.nav-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
}

.nav-toggle span {
    display: block;
    width: 25px;
    height: 3px;
    background: var(--navy-blue);
    margin: 5px 0;
    transition: transform var(--transition-base);
}

.nav-list {
    display: flex;
    gap: var(--spacing-md);
    list-style: none;
    align-items: center;
}

.nav-link {
    font-family: var(--font-body);
    font-size: 0.9375rem;
    font-weight: 500;
    color: var(--charcoal-gray);
    padding: 0.5rem 0.75rem;
    border-radius: var(--radius-sm);
    transition: all var(--transition-base);
    position: relative;
}

.nav-link:hover {
    color: var(--navy-blue);
    background: rgba(0, 45, 114, 0.05);
}

.nav-link.active {
    color: var(--navy-blue);
    font-weight: 600;
}

.nav-link.active::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 30px;
    height: 2px;
    background: var(--gold);
}

/* === Trust Bar === */
.trust-bar {
    background: var(--light-gray);
    border-top: 1px solid #E0E0E0;
    padding: var(--spacing-sm) 0;
}

.trust-container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 var(--spacing-md);
    display: flex;
    justify-content: space-around;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

.trust-item {
    font-size: 0.875rem;
    color: var(--charcoal-gray);
    font-weight: 500;
    text-align: center;
}

.trust-number {
    font-family: var(--font-heading);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--deep-red);
    margin-right: 0.25rem;
}

/* === Hero Section === */
.hero {
    background-image: 
        linear-gradient(
            to bottom right,
            rgba(0, 45, 114, 0.92),
            rgba(0, 45, 114, 0.60)
        ),
        url('../images/heroes/CNS_HAL125545_v2.webp');
    background-size: cover;
    background-repeat: no-repeat;
    background-position: center right;
    background-attachment: fixed;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
    padding: 120px 0;
}

.hero::after {
    content: "";
    position: absolute;
    inset: 0;
    background: radial-gradient(circle at 30% 30%, rgba(212, 175, 55, 0.08), transparent 70%);
    mix-blend-mode: overlay;
    pointer-events: none;
    animation: glow 8s infinite alternate;
}

@keyframes glow {
    from { opacity: 0.3; }
    to { opacity: 0.5; }
}

.hero-bg-overlay {
    display: none;
}

.hero-content {
    position: relative;
    z-index: 2;
    max-width: 800px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
    text-align: center;
    color: var(--white);
}

.hero-headline {
    font-size: clamp(34px, 4.4vw, 48px);
    font-weight: 700;
    color: var(--white);
    margin-bottom: var(--spacing-lg);
    line-height: 1.1;
    text-shadow: 0 2px 6px rgba(0,0,0,0.35);
}

.hero-subhead {
    font-size: 18px;
    color: rgba(255,255,255,0.9);
    margin-bottom: var(--spacing-xl);
    line-height: 1.6;
}

.hero-cta-group {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: var(--spacing-lg);
}

.hero .btn-secondary {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    color: var(--white);
    border-color: var(--white);
}

.hero .btn-secondary:hover {
    background: var(--white);
    color: var(--navy-blue);
    border-color: var(--white);
}

.hero-microcopy {
    font-size: 14px;
    color: rgba(255,255,255,0.8);
    margin-top: var(--spacing-lg);
}

/* === Page Hero (Internal Pages) === */
.page-hero {
    background: var(--navy-blue);
    color: var(--white);
    padding: var(--spacing-3xl) 0 var(--spacing-2xl);
    text-align: center;
}

.page-title {
    font-size: var(--fs-h1);
    color: var(--white);
    margin-bottom: var(--spacing-md);
}

.page-intro {
    font-size: 1.125rem;
    color: rgba(255,255,255,0.9);
    max-width: 800px;
    margin: 0 auto;
}

/* === Grid Layouts === */
.gap-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-xl);
    margin-top: var(--spacing-xl);
}

.pillars-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-xl);
}

.testimonials-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-xl);
}

.promises-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-xl);
}

.value-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-xl);
}

.attendees-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-xl);
    margin-top: var(--spacing-xl);
}

.speakers-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-xl);
}

.tickets-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-xl);
}

.highlights-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-xl);
}

.hours-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
    margin: var(--spacing-xl) 0;
}

.categories-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: var(--spacing-xl);
    margin-top: var(--spacing-xl);
}

.travel-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-xl);
}

.hotels-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-xl);
}

.contact-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-xl);
}

/* === Execution Gap Section Premium Styling === */
.execution-gap {
    background: linear-gradient(135deg, #FFFFFF 0%, #F8F9FA 100%);
    padding: 100px 0;
    position: relative;
    overflow: hidden;
}

.execution-gap::before {
    content: "";
    position: absolute;
    bottom: 0;
    right: 0;
    width: 600px;
    height: 600px;
    background-image: 
        repeating-linear-gradient(0deg, rgba(0,45,114,0.02) 0px, transparent 1px, transparent 20px, rgba(0,45,114,0.02) 21px),
        repeating-linear-gradient(90deg, rgba(0,45,114,0.02) 0px, transparent 1px, transparent 20px, rgba(0,45,114,0.02) 21px);
    opacity: 0.5;
    pointer-events: none;
}

.execution-gap .section-title {
    position: relative;
    display: inline-block;
    font-family: 'Montserrat', sans-serif;
    font-weight: 700;
    font-size: 42px;
    color: var(--navy-blue);
    margin-bottom: var(--spacing-xl);
    padding-bottom: var(--spacing-md);
}

.execution-gap .section-title::after {
    content: "";
    position: absolute;
    bottom: 0;
    left: 0;
    width: 80px;
    height: 3px;
    background: var(--gold);
}

.execution-gap .section-intro {
    line-height: 1.6;
    color: var(--charcoal-gray);
    margin-bottom: var(--spacing-2xl);
}

.gap-divider {
    width: 40%;
    height: 1px;
    background: var(--gold);
    opacity: 0.4;
    margin: var(--spacing-2xl) auto;
}

/* === Gap Cards with Premium Elevation === */
.gap-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-xl);
    margin-top: var(--spacing-2xl);
}

.gap-focus, .gap-outcome {
    background: var(--white);
    border: 1px solid rgba(0,45,114,0.06);
    border-radius: var(--radius-md);
    padding: 28px;
    box-shadow: var(--shadow-soft);
    transition: transform 280ms cubic-bezier(.2,.9,.3,1), box-shadow 280ms ease;
    opacity: 0;
    transform: translateY(30px);
    animation: fadeUp 0.8s ease forwards;
}

.gap-focus {
    animation-delay: 0.1s;
}

.gap-outcome {
    animation-delay: 0.2s;
}

.gap-focus:hover, .gap-outcome:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-strong);
}

.gap-focus h3, .gap-outcome h3 {
    font-family: 'Montserrat', sans-serif;
    font-weight: 600;
    font-size: 22px;
    color: var(--navy-900);
    margin-bottom: 8px;
    position: relative;
}

.gap-focus h3::before, .gap-outcome h3::before {
    content: "";
    display: block;
    height: 4px;
    width: 72px;
    background: linear-gradient(90deg, var(--gold), var(--gold-strong));
    margin-bottom: 12px;
    border-radius: 2px;
}

/* === Lists === */
.focus-list, .outcome-list {
    list-style: none;
    margin-top: var(--spacing-md);
}

.focus-list li, .outcome-list li {
    padding: 9px 0;
    padding-left: 28px;
    position: relative;
    line-height: 1.6;
    color: var(--charcoal);
}

.focus-list li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 14px;
    width: 10px;
    height: 10px;
    background: var(--gold);
    border-radius: 50%;
    box-shadow: 0 0 8px rgba(212, 175, 55, 0.4);
}

.outcome-list li::before {
    content: '✓';
    position: absolute;
    left: 2px;
    top: 5px;
    color: var(--green);
    font-weight: bold;
    font-size: 20px;
}

.check-icon {
    display: none;
}

/* === Fade Up Animation === */
@keyframes fadeUp {
    from { 
        opacity: 0; 
        transform: translateY(30px); 
    }
    to { 
        opacity: 1; 
        transform: translateY(0); 
    }
}

/* === CTA Sections === */
.cta-final, .cta-organiser, .cta-agenda, .cta-sponsor, .cta-expo, .cta-tickets {
    background: var(--light-gray);
    padding: var(--spacing-3xl) 0;
}

.center {
    text-align: center;
}

.cta-title {
    font-size: var(--fs-h2);
    color: var(--navy-blue);
    margin-bottom: var(--spacing-md);
}

.cta-description {
    font-size: 1.125rem;
    color: var(--charcoal-gray);
    margin-bottom: var(--spacing-lg);
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

.cta-buttons {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    flex-wrap: wrap;
}

/* === Footer === */
.footer {
    background: var(--navy-blue);
    color: var(--white);
    padding: var(--spacing-3xl) 0 var(--spacing-md);
}

.footer-container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

.footer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
}

.footer-heading {
    font-size: 1.25rem;
    color: var(--white);
    margin-bottom: var(--spacing-xs);
}

.footer-logo {
    height: 44px;
    width: auto;
    max-width: 220px;
    margin-bottom: var(--spacing-md);
    object-fit: contain;
}

.footer-tagline, .footer-org {
    font-size: 0.875rem;
    color: rgba(255,255,255,0.8);
    margin-bottom: 0.25rem;
}

.footer-title {
    font-size: 1rem;
    font-weight: 600;
    color: var(--gold);
    margin-bottom: var(--spacing-sm);
}

.footer-links, .footer-contact {
    list-style: none;
}

.footer-links li, .footer-contact li {
    margin-bottom: 0.5rem;
}

.footer-links a, .footer-contact a {
    color: rgba(255,255,255,0.85);
    transition: color var(--transition-base);
}

.footer-links a:hover, .footer-contact a:hover {
    color: var(--gold);
}

.footer-bottom {
    border-top: 1px solid rgba(255,255,255,0.2);
    padding-top: var(--spacing-md);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--spacing-md);
}

.footer-copyright {
    font-size: 0.875rem;
    color: rgba(255,255,255,0.7);
}

.footer-legal {
    display: flex;
    gap: var(--spacing-md);
}

.footer-legal a {
    font-size: 0.875rem;
    color: rgba(255,255,255,0.7);
}

.footer-legal a:hover {
    color: var(--white);
}

/* === Utility Classes === */
.text-center {
    text-align: center;
}

.mt-0 { margin-top: 0; }
.mt-sm { margin-top: var(--spacing-sm); }
.mt-md { margin-top: var(--spacing-md); }
.mt-lg { margin-top: var(--spacing-lg); }
.mt-xl { margin-top: var(--spacing-xl); }

.mb-0 { margin-bottom: 0; }
.mb-sm { margin-bottom: var(--spacing-sm); }
.mb-md { margin-bottom: var(--spacing-md); }
.mb-lg { margin-bottom: var(--spacing-lg); }
.mb-xl { margin-bottom: var(--spacing-xl); }